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EDIT :: back-compat.php

<?php /** * Twenty Seventeen back compat functionality * * Prevents Twenty Seventeen from running on WordPress versions prior to 4.7, * since this theme is not meant to be backward compatible beyond that and * relies on many newer functions and markup changes introduced in 4.7. * * @package WordPress * @subpackage Twenty_Seventeen * @since Twenty Seventeen 1.0 */ /** * Prevent switching to Twenty Seventeen on old versions of WordPress. * * Switches to the default theme. * * @since Twenty Seventeen 1.0 */ function twentyseventeen_switch_theme() { switch_theme( WP_DEFAULT_THEME ); unset( $_GET['activated'] ); add_action( 'admin_notices', 'twentyseventeen_upgrade_notice' ); } add_action( 'after_switch_theme', 'twentyseventeen_switch_theme' ); /** * Adds a message for unsuccessful theme switch. * * Prints an update nag after an unsuccessful attempt to switch to * Twenty Seventeen on WordPress versions prior to 4.7. * * @since Twenty Seventeen 1.0 * * @global string $wp_version WordPress version. */ function twentyseventeen_upgrade_notice() { $message = sprintf( __( 'Twenty Seventeen requires at least WordPress version 4.7. You are running version %s. Please upgrade and try again.', 'twentyseventeen' ), $GLOBALS['wp_version'] ); printf( '<div class="error"><p>%s</p></div>', $message ); } /** * Prevents the Customizer from being loaded on WordPress versions prior to 4.7. * * @since Twenty Seventeen 1.0 * * @global string $wp_version WordPress version. */ function twentyseventeen_customize() { wp_die( sprintf( __( 'Twenty Seventeen requires at least WordPress version 4.7. You are running version %s. Please upgrade and try again.', 'twentyseventeen' ), $GLOBALS['wp_version'] ), '', array( 'back_link' => true, ) ); } add_action( 'load-customize.php', 'twentyseventeen_customize' ); /** * Prevents the Theme Preview from being loaded on WordPress versions prior to 4.7. * * @since Twenty Seventeen 1.0 * * @global string $wp_version WordPress version. */ function twentyseventeen_preview() { if ( isset( $_GET['preview'] ) ) { wp_die( sprintf( __( 'Twenty Seventeen requires at least WordPress version 4.7. You are running version %s. Please upgrade and try again.', 'twentyseventeen' ), $GLOBALS['wp_version'] ) ); } } add_action( 'template_redirect', 'twentyseventeen_preview' );

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